I have many Apps...I removed a lot off my iPod to try and improve its speed. Seems to have worked. I used to spend lots of time on Angry Birds. I wasted a bit of money on Seasons just as I started to lose interest, but I was still obsessed when Star Wars came out and I played that.

Mostly though, I just use Twitter, Facebook, Instagram and Pocket. Pocket's this app, comes as an extension for Chrome / Safari / probably Firefox, where you can save articles to read later. I use it so I have something to read during my lunch break at work.
The only game I've really been playing is Simpsons' Tapped Out. It's just so addictive. Just search it on the App Store / Android equivalent, it's fun.